I started this tank about 6 months ago making lots of changes along the way. I started in january with pretty basic understanding of how an aquarium works but now i have learnt alot more from people and this website (its a 15 gallon btw)

I started without any co2, basic filter and low light. Now i have a better filter and also med-high lighting with diy co2 (im only 14 years old). Recently (1 week or so ago) I have added several plants and i hope for them to grow. These plants are: Eusteralis stellata, ludwigia palustris green, alternanthera cardinalis, cabomba california. these have started off really well and they are looking great! Also i had plants before which i added about a month ago, these are: Eleocharis acicularis (for a carpet style) and Rotala wallachi.
The hair grass is doing well and creating a nice carpet but (THE BIG BUT) the rotala's leaves below the crown are black! The crown nearest the surface is nice and green but the rest is black! Any help on this????

I do weekly water changes (25%) with parameters of:Ammonia-0ppm
Nitrite-0ppm
Nitrate-10ppm
PH-6.6

I havent got a test kit for water hardness of anything but my co2 levels seem to be around 20-30ppm with around 1bps. (diy fluctuates alot ey?)

What is it about 15 gallons that just hits the spot for me? It will be totally awesome once the Eleocharis fills in. It looks really good in it's current state though.
Have you had any trouble with the Red Tailed shark bullying other fish? I have tried them a couple times, and they are always diabolically territorial.

Thanks for the replies Onefang, I have had some problems with it only being territorial wiht my sucking loach but the sucking loach really is terrible for it so im thinking of getting rid of the loach and replacing with some shrimp as they look nicer Problemman, I get what you mean as my uncle has a tank and he says he doing anything for his too look like it XD Personally im not liking it much :/ I would like to rip out that rotala (next to filter, looks straggly) and replace with something... Any ideas?

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